Takes a special kind of chilled out guy to go through that painstaking process with professionalism from start to finish. The gentleman there fit the bill perfectly.
That machinist is an excellent teacher and communicator. His explanation is so precise and thorough. He should be teaching in a vocational college. What a Professional. I salute him.
thanks for creating this video. I am currently enrolled in a local auto tech program and we found your site during class. you have excellent videos that translate volumes of information in a condensed and comprehensive format. your efforts are appreciated.
+ewvoss68 We? Wow, that's pretty dang cool! An auto tech program taking advice from ME. I have zero formal training in automotive technology, I just make videos about the things I'm interested in. Over the years I just read everything I could find about those interests and listened to everyone who had experience on those topics... so for your sake [and to stay true to everyone who watches], I will be forever humble and recommend you still read all those volumes I helped you skip. My goal is to help others visualize the job so that those volumes make more sense. If you can do that, you will be a better automotive technician than I will ever be. ;)
Your machine shop is awesome for participating in the video. He did a great job of explaining everything he was doing. You certainly can't do that type of work without very specialized equipment. That's what machine shops and machinists are there for. You have a great relationship with you guys over there. Let him know he has my thanks next time you see him. I learned a lot and watched every second. Your machinist cares about precision performance work. Yet another awesome video.
Jafromobile and Mark. What we can learn from others never ceases to amaze me. But, Its the people like you who take the time and show the patience to make accessing that knowledge possible. Thanks so much! I've learned a LOT in just two, well produced videos with thoughtful and articulate narration.
This machinist is legit. Taking the needed time to check and recheck. Not forcing or rushing anything, I like what I see. As far as I am concerned, that part is a wrap. I love it when a plan comes together! Real good video. You usually don’t see stuff like this on crap tv videos on cable. The machine shops they use wouldn’t let you video their work! Some people just don’t get the level of repetitive tedium that is standard manual machining. It isn’t that it is hard to learn or do, but it is repetitive and it can be tedious. You have to be ok with that. Doing a stellar job despite the obstacles is what sets this guy’s work from the others and being honest too!👍🏻
I'm not even much of a DSM fan, but I've pretty much watched all of your videos because of how informative they are. I learn MANY new things every time you post a new vid. Thank you, and keep up the great work!
Great video and makes me understand why good machinists charge what the charge. Uploads like this are the asset to TH-cam and hate when persons who don't have the wisdom and expertise such as yourself are of a sudden SME's and critiquing what you took the time to share what you could have kept to yourself. Thanks so much for best 29 minutes i have spent on YT in a while.
Man this is awesome. I love how much pride this guy takes from doing his job so well. Makes me want to become a machinist! It's awesome that they let you watch/film their work. Great stuff.
In my heart of hearts I always wanted to work with my hands machining and building stuff. I love your videos dude. It tickles that 'what could have been' sorta feel in me. Alas, I had to be all computer oriented and do most of my stuff in the virtual confines of software....and the hardware side...pulling cables and building out network infrastructure, just isn't the same as this stuff..
You're absolutely right. It's not the same at all. That's why when I get home from pulling cables, building images for mass deployments, setting hardware and software standards, configuring LDAP layers and network topology, configuring and maintaining server environments, coordinating with 14 other technicians, dozens of vendors, and supporting about 9,000 users total, I grab my tools and wrench on cars. ;) It helps me relax.
OH my God! I completely missed this reply all those years ago. You rule dude. Also, I actually started woodworking as a hobby in the meantime. Nothing too serious, but I've picked up manual skills since then. Cheers dude. I still watch your videos to this day. :D
Amen to that! I feel guilty thinking I could pull my head and put some rubbing compound on my valves to seat them. I was so out-classed in that video ... I know nothing :(
Thank you so very much for this video I've been wanting to see this for so many years.. In my head I've been trying to figure out how they were able to perfectly align the machine for every brand and model of engines out there ! Thats awesome I want to quit my job and do that !
Brilliant, ive never seen valve seats cut before, that man is a true professional, he wants them spot on :-) Worth every penny mate, you know they will give excellent results :-) Love engineering videos:-)
Where the heck can somebody today, in 2020, learn how to do all that professionally? College? Apprenticeship? Do you have to be born into a machining family? These are serious skills here!
good thing your machine is cool with you filming, where i live, some machine shops here act like what they're doing is top secret so they dont like being filmed.. thnx for the upload bro
Your vids KICK ASS man! Seriously you are one of the best, you take the time to show and explain things, you share the little secrets and you do top quality work! Thank you very much for everything, it sure keeps me happy watching your work over and over again! Mark also seems a top bloke. He does excellent work, unlike the butchers we got over here calling theirselves "machinists".. Wish I was closer to you guys, you'd have a helping hand and Mark would sure have my work in! Thanks again Jafro!
I think, out of all the tuning, this point in the process making the head more efficient, gets missed by a lot of back yard car enthusiasts.Thank you Jafromobile for showing everyone what is required in getting true power and reliability from your stock head. Also, I must ask, can you heat treat the valve train assembly before getting this work done, or is it better to do it afterwards. Great videos, a true joy to watch.....
Thank you, Jafromobile, for another top quality video. The gold edition of motor-technical educating/instructional/how to DIY on TH-cam! I don't write comments on every one, and I haven't seen everyone, but I suspect all of them are good. :)
Nice work. On a not new engine/head, before going any valve seat cutting, check for ware in the valve guide. An oversize/worn guide will allow the valve to rattle rather than close cleanly. Use an oval go/not go gauge to check for ovality. Oh, and check for ware of the valve stem for the same reason. Also if there is any combined tolerance build up, lowering the valve in the guide by recutting will hide this but it will very soon reappear. Checking for wear should be done before machining to prevent this. Get rid of any discernible wear before starting to improve things from stock.
I have found that some magazines & people make this process seem so complex & out of reach for most of us. I do understand that good valve geometry is essential for good performance & certain things get done because of factory setup or just wear. From what I can tell there must be a fair bit of compromise doing valves, seats, lapping etc. Cheers bud. :)
That Sunnen seat machine is ancient technology now, only a step above someone with a grinding rock and hand tools. The shop is taking care of it and using it properly so the work is good but could be better with some minor changes. That machine will only be as good as the care put into set-up for the cut. I would have liked to see the machinist show the process for checking taper and wear in the valve guides prior to setting the head up for making cuts as these are used guides and will have wear inside. There should be a selection of sizes to choose from for the pilot rod so you can find the tightest fit while the pilot still remains free moving in the guide. Pilot rods can be sized by the 1/10 of a thousandth when ordered. The closer that rod fits the better the end result. I only saw one rod chosen and it was forced down into the seat for the guide leveling process, something that should be avoided as you can force the guide to wedge at an angle when inserted into a less than ideal guide bore when the shoulder on the pilot meets the possible tapper at the end of the guide. This can cause the seat to be tilted in relation to the guide and that tilt will transfer to all later cuts. You should always chuck NEW or used valves into a face cutter to check for bent or out of round valves even if you do not plan on actually facing them. I can see a rounded leading edge on his seat cutter in the video, a touch-up with a green wheel would bring his cutter to life again and result in a better seat. If you notice in the video the pilot wobbles in the hole as he makes the cut to the seat because the cutter is dull and he's rubbing the profile into the seat more than he is cutting the seat. That will have a pretty finish but the job could be much better done with a correctly sharpened seat cutter. The idea here is to make the hole round and it could be much rounder if the cutter is sharp and not deflecting 1/16 an inch in every rotation of the spindle. You notice he said he was planning to lap the seats. That's not a process you need when your machine is rigid and your cutter is sharp but it's a better process than running a dull cutter on a side-loaded wobbling pilot and calling it a done deal. Granted he only lapped one set of valves to verify his seat location. Lapping valves is a step backwards towards the grinding rock as you are using grit to finish your seat which in poorly trained hands can embed the grit into the seat and valve faces and continually grind away at your seat work as the valve rotates in an operating motor. This problem can be seen on heads with lapped seats in motors that are run for a short time and are pulled apart at a later time. The seats will grind them selves wider and wider making the work put into having the sealing pressure being concentrated in as thin a seating surface as possible be a wasted effort after some running time. The embedded grit doesn't go away it gets pushed into the valve face deeper and deeper as the engine runs allowing it to continue a cutting action on the seat job. Slamming the valve into the seat while lapping will embed the grit of the compound into the valve face. I can hear and see this being done in the video, not an ideal way to do the work but in the long run it is not the end of the world. An engine is an air pump. It will work when it is worn out or perfectly machined. Hard run race engines are put together with loose tolerances for reliability yet the same engine going into a passenger car for use in commutes is put together tightly for reliability. At the end of the day any reasonable amount of effort will give you a working product and I have respect for people who do the best they can with the tools they have.
i love all this ill OCD machining/engine build stuff, radial cut, dome geometry and volume balance, dynamic rotational mass crank balancing and so on, felt so good
I work with block heads every day for a year and I rest watching videos about it at home. Lmao kkkk best work for someone who wants to start a career with engines or engineering, you can learn a lot from these workshops.
Yessir! I'm so grateful to Ballos Machine for letting me in here for this. I have a few career-oriented channels in my subscriptions as well. I laugh at myself for the same thing!
For the intended purposes of this video, it was very good. It was nice for that guy to walk the audience through. But for any one here that does performance cylinder heads or knows the process, probably will approach the valve job differently. Just a couple things I saw and disagree with was that he seemed to use too aggressive of lapping compound. I use nothing more than 400 grit and you should use dykem on the seat and valve to see if it cut concentric or not. As far as the cutter, there is nothing performance about a 30/45/60. That is a normal valve job you'll get from a rebuilder shop. Once again, not bashig by any means, just voicing my perspective on this. All in all, I think this is great you take your time to make videos for the public. Good on you for that.
+recordbreaker5 There are many aspects of performance, and many points I agree with you on… for instance, I hate radius cutters in general. That's not my preferred equipment for cutting valve seats on any performance job, but it costs $1700 less and isn't what's responsible for the biggest gains that I'll be able to feel or measure from the driver's seat. To me, that's money well saved. While a valve seat can be a limiting factor, it's not where the majority of "performance" gains come from. Keep in mind, when Mark says "performance cutter", all it denotes is that there are 2 kinds of cutters available for this particular machine. Variations in how wide the 30/45/60 angles are… are why it's referred to by Sunnen as a "performance cutter". The "performance cutter just has a longer 30 on it, and a shorter 45 and 60. It's intended to move the seat out closer to the margin of the valve which actually shortens the life of the valve job, but improves airflow over a standard cut. It's that simple. If anyone hears "performance cutter" and assumes that using that tool automatically means they're going to end up with the ultimate valve job in under 2 hours and for less than $300, then they're a victim of their own assumptions. It's just a seat that flows better than the standard cutter will cut. A seat that doesn't match the exact lengths of the recommended 30, 45 and 60 cuts. One that Sunnen claims will flow better. A standard seat has wider 45's and 60's so that the valve job lasts longer. It trades flow for a bit more durability, that's all. The weakest link in 99.999997% of professionally-built "performance cars" is always the driver, not the valve seats. "Performance" is the most abused term in automotive engineering because what's the standard? Performance what? Whenever someone thinks they have a "high performance" machine, they get butt-hurt the moment they find out someone else is faster. Problem is… someone else is always faster. Unless their name is Kye Kelly of course. If the standard is "flows better than stock", then nearly any bolt-on upgrade from an air filter to an exhaust tip turns a street car into a performance car. That's awesome from a sales pitch perspective, but that won't change Kye Kelly's opinion of your car. That's why performance is a subjective term. It's splitting hairs. He-said-she-said. All "performance" denotes is it's intended use. Putting a 9 angle valve job on a normally-aspirated economy car won't magically turn it into a "performance car", just like using a standard cutter on a GT-40's valve seats won't turn it into an economy car. You also mentioned the same thing I think about permatex lapping compound. I've actually mentioned that in this video, and a previous video where I covered the shade-tree approach to valve jobs. If someone wants to spend $2,000+ or 100 hours dressing stones and cutting seats for 3 extra CFM, then they know what their reasons are, but everyone else is going to end up with a valve job done on a radius cutter because the machinists doing the work would rather not spend their whole week on it, and because in nearly every practical case with every rebuild, $2,000 can make a much bigger difference somewhere else. I've got a set of GTP heads for reference. I know what actual "performance" heads look like. You're correct, perspective is everything in this discussion. I'm not arguing with you, I'm agreeing with you. The reason I made this video is because nobody who knows how to grind the highest performance seat has the camera, knowledge, ability, or drive to make free educational videos for the public on how to do it because it works against their livelihood. That, and they've spent their lifetime developing different talents. Of course, if I'm wrong about that, I'll be the first person to favorite, like, subscribe to and share their video with my audience because I love that kind of shit and so do the people who follow me. :)
excellent vidja, great to be able to peak over the shoulder of a pro at work, Mark the machinist would be a good teacher, explaining every step along the way, thanks.
That cylinder head is a work of art--absolutely beautiful. Jaguar? I worked with Chrysler with the original Hemi in the 1950's--what we wouldn't have given to be able then to advance to a 4-valve layout (but the accountants would have vetoed it, as they did with the original hemi in 1958). It's not well known why exhaust valves are usually of a smaller diameter than intake: the physical mass flowing through the exhaust valve is significantly less than the intake due to the extraction of energy from the gas/air mixture , which departs through the crankshaft.
Great video and top notch workmanship-- many years ago I had a 74 Kawasaki Z-1 900 bored out to 1015 cc and I had Manley SS oversize valves that had 'reliefs' for better flow, also had the runners cleaned up and port matched, Megacycle 417 lift cams too
Absolutely brilliant. I loved the CV joint on top of the valve grinder to use the machine torque but not the head bearing. Using the seat itself as the rotory guide is standard I guess but I never knew.
Hey there jafro, I've been subscribed to you just to watch and learn some Asian tech, I'm a GM master tech and grew up building big inch 1/4 engines. Great videos and very informative. Gotta remember to mention the engine is just a pump, all of your power is made from airflow I. E. heads and the right combo. If you already did I apologize. Sorry for rambling. Keep it up brother.
***** That is hilarious! You're the second one to point that out. Who would you rather have working on your head? The Bob Ross, or the John McEenroe machinist? :P
The Da vinci of cylinder heads maybe even. Makes me wish the technology from the movie "Brainstorm" was an actual thing. Just burn every iota of that expertise into my mind. This guy truly knows his beans.
Not gonna lie, I was hoping I was going to see something here to encourage me that a home valve job is possible since I seem fascinated with precision machining. No joy. I also just priced that Sunnen machine. Ouch. Thanks for the video and to your machinist, his explanations are excellent.
check out newaymfg.com. There are affordable home cutter solutions. Amazon has many sets available that are about equal to what a machinist charges for cutting seats. Don't leave the guides out. I just did a great video about this inspecting my Galant VR-4 heads. Make sure the rest is up to snuff before buying that cutter.
@@Jafromobile I actually just watched a few videos on that because I saw it in the Goodson catalog. I wouldnt even mind the motorized tool and their valve grinder at some point...or at least buy the transmission shaft and use my variable speed drill motor. Do you know if they have a decent 75 degree cutter or whatever you would use to oversize the valve properly? Thanks for supporting your older videos!
I am in the industry (Regis shop supplies) and I love watching him. It really is like watching Bob Ross paint happy little trees! I've been in a few of those wrench throwing shops.....
This is great, I loved watching this. Big thumbs up. One thing: he said this method is better than grinding because the radius provides better flow. Another guy on her who uses stones says grinding is better. I'm beginning to think it doesn't really matter.
I went school for this. watching videos great refresher course for me. Especially this video man you reminded of my instructor from last MA class. You make a great teacher. :)
Clarence Vaughan Man, I didn't even do all the hard work. I hope you're talking about Mark. That's one even-keeled dude. I always have a great time working with him.
Jafro, your videos have been instrumental in me learning engine rebuild skills. Especially related to head work. Its saved me a lot of money on my bmw engines so far 😆
Used to use an old machine like this. Did a great job but tedious and time consuming lining everything up. Got onto a Serdi after that and man what a difference! Much better design!
...chamber and sunken exhaust valve seats to reduce the amount of the intake air charge that flows through the exhaust valve during the overlap period. You can read more about it online on his website. The case study he used was of a heavily turboed (38lb boost) Mitsubishi 2L motor putting out approximately 700hp, after installing the POLYquad head he saw gains of ~90hp at 5lbs less boost pressure. Pretty cool stuff that might be worth checking out!
Hey Jafro, you should look into building a POLYquad cylinder head, This dude David Vizard "invented" it. Basically 4 valve heads generally have poor low end torque because they don't have a lot of swirl at low RPM that promotes good fuel atomization and a more complete combustion. 4 valve heads are also prone to shoot fuel out the exhaust valve during valve over lap. The POLYquad head solves these problems by using different sized valves with a flow bias to promote swirl in the combustion...
Your Mitsushitty might be the first one that actually runs real good after all this work you've done and had done. Like you said they cast these heads like total garbage. You need to put the care into it to make it run right. Doing great! Got a vid of it all done? Love to see it...
This is the build that's taken 7 years to start. I've been quietly stockpiling more parts and more tools for it while accidentally building one of the world's fastest Elantras. That was a stupid achievement that could be easily shattered with enough welding wire and lack of concern for safety, but you're not late to the party, and this head is about to get put to use. What you saw wrong with this head is nothing like that Elantra's cylinder head's problems were like. The head here was from an early production (October 1994) second generation Eclipse GSX. The earliest of the 2g's before they sold out of their entire inventory which made Mitsubishi turn the production lines up to 11 and rushing everything else. This casting is the best they ever did for a USDM 4g63. But it's their post-casting handling and cleanup that has always sucked no matter what country it was cast in or when. The casting on this head is amazing compared to the one on the Hyundai. They both had the same post-casting cleanup issues with the flash obstructing the oil return, both had rough, sharp protruding casting lines, but the GSX head didn't have mis-aligned ports or Swiss cheese holes in any of the casting. It didn't have large protruding casting flash inside the runners. She's straight as a tick. This is the good one. This is the engine you will finally see getting built right now. There's a lot of great technical videos that came from that Hyundai along the way, though. It was an all stock parts build, already auto-to-manual swapped when I got it. I blew both it and my GSX up at the same time leaving me with 3/4 of my fleet broken and un-driveable. I put my GSX's cams, valve springs and turbo in the Elantra as hand-me-downs to get it going. I bought performance parts for the Colt that actually came off of this car. I threw in a spare crankshaft I had sitting around and re-machined everything else back into shape, re-used everything else in the same rotating assembly that blew up before, I didn't even hone it, and it's about to be one of 3 total Elantras on the planet that have ever run a 12 second 1/4 mile pass. There's only 2 right now in the databases. It's inevitable that I will be the third. It's just my spare used parts from engines that my friends and I have blown up thrown in a junkyard chassis. This just doesn't make that much sense to me that the bar is set this low. But anyway, I want to welcome you aboard with these cliff notes so you can see what happened here, why there was a GSX build underway that suddenly turned into technical videos about an Elantra. The Elantra is NOT my first love. The GSX is what I've been working on lately, it's the one I won car shows with, and it's coming back better than ever before. The Galant in my driveway is a car that I bracket raced through the quarter-finals in 10 years before I bought it. On our first rounds racing, my Galant's owner's opponent red-lighted, and I out-ran my dial-in time, breaking out, and ended my night early. He threw me the keys and I completed 5 more rounds of eliminations in his car. I was having such a good time I didn't realize I went out in the quarterfinal race. This was back when it was his daily driver. The track ended up mailing him a check for his winnings. This channel originally was originally supposed to be about a Dodge Colt, because everything else used to run. So, welcome aboard!
Sir,,it's the,best way to,work on,all Cylinder, all heads taking special care, n precision, increased horsepower, help to cut n reduce pollution, n,helped ,to save fuel,,,(is not the, engines, is the problem,,,is we,) thanks u,sir,,
very nice vid! these mods will improve the cilinder filling a lot , most gains will be at low valve lift, both on opening and closing of the valves. The engine should gain torque over the entire rev range. And maybe also start spooling up the turbo at a lower rpm.
the operator needs to check the bubble on the head of VGS machine first,then adjust cylinder head to vgs head for north and south adjustment. then set bubble for left and right tilt on cylinder head then adjust vgs head to cylinder head.
Awesome video. That machine is incredible. So precise (granted you set, check and recheck). I like the level transfer. That is a real true. Gravity doesn't lie.
He did a great job with the old sunnen machine. I actually prefer that machine over the fancy part cnc sunnen with the touch screen. For how expensive that machine is you would think the touch screen would be better.. but one big thing here is that the whole port is based around your valve size. To get the most out of your heads you are going to want to do a bowl cut and blend your valve job again with your bigger valves. Dont forget you need to resize your venturi! Extremely important!
ok I've watched a load of your videos Jafro and I've come to the decision.....This job as a auto fitter is boring, I really enjoy the machining of engine components and therefore must find a machine shop to work in. lol Cheers for the very interesting and informational vids and keep um coming!
+Victor Bangle Your replies are disabled. It's not the head that was moving. The table this is on weights over 800lbs. Actions were taken to compensate for this in this very video. There's always a couple thousandths of an inch of deflection in the guide because if there wasn't, it would get stuck inside the valve guide. The reason you cut, inspect, lap, cut again, lap again and inspect is to ensure you're setting your stops correctly. If it chatters, that's bad... but the process accounts for the smaller guide variable.
OK HEY I NEED EVERYONE TO HELP ME I need new valves and seats for my Honda trx450r. If I buy a new cylinder head and valves that are the same dimensions will it be ok and work. Oem cylinder head, oem shape valves or something like that you get what I mean but will it take any work or valve cutting after that
Damn! I never knew how much work they put into this, thought it was a simple as 1, 2, 3, Good work machine shop and good job filming and the effort to help us all :D.
Awesome video! Big props to your machinist for letting you film all this and talk you through everything. Looks like you have a good relationship built there. In watching this I have one question. Why machine these flat, angled surfaces in to our valves for improved air flow when(by my reasoning) flow could be even better with a radiused(rounded) surface into and out of the combustion chamber apart from the flat valve-valve seat surface???
You could do voice stand ins for Matthew McConaughey, I walked in my bedroom and this vid was playing but I was busy doing something, but I wondered what movie was on, I recognized none of the lines.
2:00 a 6 or 7 inch pair of needle nose vise grips works almost as near as fast as that tool does. Well, maybe its 2 times slower but it still gets the job done well and somewhat quick.
Wow.. thank you for this video.. extremely well done! Mark explained it well. This is the correct way to do it. Now I know what went wrong with my valve job I had done a while back... I can confirm it was a HACK crap job! I know what to look for now.. Thanks again.. Kudo's!
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Takes a special kind of chilled out guy to go through that painstaking process with professionalism from start to finish. The gentleman there fit the bill perfectly.
Agreed. This machinist is awesome.
@@mostlymotorized Craftsmanship is it's own reward .Just made that up.
लमलममनकनगव
but he doesn't have a clue on making videos. Did You see anything through that magnifying glass?
almost 2 mill views and only 132k subs. he really does it for use. thanks man youve thought me a lot over the years even today. thank you
I was a Sunnen salesman for 40 years. My hat is off your one of the few people that I have seen that runs the VGS20 correctly,
That machinist is an excellent teacher and communicator. His explanation is so precise and thorough. He should be teaching in a vocational college. What a Professional. I salute him.
I love falling asleep to these technical videos... i’m not saying that they’re boring but your narration is just so soothing
thanks for creating this video. I am currently enrolled in a local auto tech program and we found your site during class. you have excellent videos that translate volumes of information in a condensed and comprehensive format. your efforts are appreciated.
+ewvoss68 We? Wow, that's pretty dang cool! An auto tech program taking advice from ME. I have zero formal training in automotive technology, I just make videos about the things I'm interested in. Over the years I just read everything I could find about those interests and listened to everyone who had experience on those topics... so for your sake [and to stay true to everyone who watches], I will be forever humble and recommend you still read all those volumes I helped you skip. My goal is to help others visualize the job so that those volumes make more sense. If you can do that, you will be a better automotive technician than I will ever be. ;)
Nice to hear people who know what they are doing explain the logic and process of their work
This is just like I’m at work. Same exact machines. Both of em. Was cool to see the quirks of someone else do this !
Amazing video! That guy knows his stuff, but more important he is willing to tell you WHAT and WHY is he doing it. Great guy!
Your machine shop is awesome for participating in the video. He did a great job of explaining everything he was doing. You certainly can't do that type of work without very specialized equipment. That's what machine shops and machinists are there for. You have a great relationship with you guys over there. Let him know he has my thanks next time you see him. I learned a lot and watched every second. Your machinist cares about precision performance work. Yet another awesome video.
Jafromobile and Mark. What we can learn from others never ceases to amaze me. But, Its the people like you who take the time and show the patience to make accessing that knowledge possible. Thanks so much! I've learned a LOT in just two, well produced videos with thoughtful and articulate narration.
This machinist is legit. Taking the needed time to check and recheck. Not forcing or rushing anything, I like what I see. As far as I am concerned, that part is a wrap. I love it when a plan comes together! Real good video. You usually don’t see stuff like this on crap tv videos on cable. The machine shops they use wouldn’t let you video their work! Some people just don’t get the level of repetitive tedium that is standard manual machining. It isn’t that it is hard to learn or do, but it is repetitive and it can be tedious. You have to be ok with that. Doing a stellar job despite the obstacles is what sets this guy’s work from the others and being honest too!👍🏻
I'm not even much of a DSM fan, but I've pretty much watched all of your videos because of how informative they are. I learn MANY new things every time you post a new vid. Thank you, and keep up the great work!
This machinist should teach tech classes. I could listen to him all day. Nice and consistent like his work.
The machinist has such a calming voice. I ended up feeling hypnotized from listening to him talk.
By far one of the best auto engine / mechanical videos Ive watched this year
You can be best "by far", but not "one of the best by far".... Makes no sense....
Awesome video thank you. I've been tuning imports for 22 years and finally get to see a machinist do their magic.
I am a firm believer of "precision engineering" and "eyeballing" never goes in hand and hand.
Great video and makes me understand why good machinists charge what the charge. Uploads like this are the asset to TH-cam and hate when persons who don't have the wisdom and expertise such as yourself are of a sudden SME's and critiquing what you took the time to share what you could have kept to yourself. Thanks so much for best 29 minutes i have spent on YT in a while.
Man this is awesome. I love how much pride this guy takes from doing his job so well. Makes me want to become a machinist! It's awesome that they let you watch/film their work. Great stuff.
In my heart of hearts I always wanted to work with my hands machining and building stuff. I love your videos dude. It tickles that 'what could have been' sorta feel in me.
Alas, I had to be all computer oriented and do most of my stuff in the virtual confines of software....and the hardware side...pulling cables and building out network infrastructure, just isn't the same as this stuff..
You're absolutely right. It's not the same at all. That's why when I get home from pulling cables, building images for mass deployments, setting hardware and software standards, configuring LDAP layers and network topology, configuring and maintaining server environments, coordinating with 14 other technicians, dozens of vendors, and supporting about 9,000 users total, I grab my tools and wrench on cars. ;) It helps me relax.
OH my God! I completely missed this reply all those years ago. You rule dude. Also, I actually started woodworking as a hobby in the meantime. Nothing too serious, but I've picked up manual skills since then.
Cheers dude. I still watch your videos to this day. :D
Have a whole new respect for machinists, great video.
Amen to that! I feel guilty thinking I could pull my head and put some rubbing compound on my valves to seat them. I was so out-classed in that video ... I know nothing :(
Don't forget to talk about valve seat width. Intake vs. exhaust. perf. vs. stock. great videos.
in my country, people that talk like him would be called singer, he does not talk he sings, good job at all
Thank you so very much for this video I've been wanting to see this for so many years.. In my head I've been trying to figure out how they were able to perfectly align the machine for every brand and model of engines out there ! Thats awesome I want to quit my job and do that !
Man that old timer seems to be a jewel for information. Next time you get any work done with him be sure to tape it.
Brilliant, ive never seen valve seats cut before, that man is a true professional, he wants them spot on :-)
Worth every penny mate, you know they will give excellent results :-)
Love engineering videos:-)
Nice machinist. Seems like a cool dude. Kudos to him for taking sone time to show the steps. Great video
Where the heck can somebody today, in 2020, learn how to do all that professionally? College? Apprenticeship? Do you have to be born into a machining family? These are serious skills here!
good thing your machine is cool with you filming, where i live, some machine shops here act like what they're doing is top secret so they dont like being filmed..
thnx for the upload bro
Your vids KICK ASS man! Seriously you are one of the best, you take the time to show and explain things, you share the little secrets and you do top quality work!
Thank you very much for everything, it sure keeps me happy watching your work over and over again!
Mark also seems a top bloke. He does excellent work, unlike the butchers we got over here calling theirselves "machinists".. Wish I was closer to you guys, you'd have a helping hand and Mark would sure have my work in!
Thanks again Jafro!
Ok
Man, the camera work, the editing, the knowledge, the delivery. Great vid.
I think, out of all the tuning, this point in the process making the head more efficient, gets missed by a lot of back yard car enthusiasts.Thank you Jafromobile for showing everyone what is required in getting true power and reliability from your stock head. Also, I must ask, can you heat treat the valve train assembly before getting this work done, or is it better to do it afterwards. Great videos, a true joy to watch.....
I like seeing the machinist take pride in his work !
Thank you, Jafromobile, for another top quality video.
The gold edition of motor-technical educating/instructional/how to DIY on TH-cam!
I don't write comments on every one, and I haven't seen everyone, but I suspect all of them are good. :)
Love the fact that the machine shop is using a CBN plated wheel to grind the valves. The plated wheels never loose their shape!!!
Nice work. On a not new engine/head, before going any valve seat cutting, check for ware in the valve guide. An oversize/worn guide will allow the valve to rattle rather than close cleanly. Use an oval go/not go gauge to check for ovality. Oh, and check for ware of the valve stem for the same reason. Also if there is any combined tolerance build up, lowering the valve in the guide by recutting will hide this but it will very soon reappear. Checking for wear should be done before machining to prevent this. Get rid of any discernible wear before starting to improve things from stock.
I have found that some magazines & people make this process seem so complex & out of reach for most of us. I do understand that good valve geometry is essential for good performance & certain things get done because of factory setup or just wear. From what I can tell there must be a fair bit of compromise doing valves, seats, lapping etc. Cheers bud. :)
That Sunnen seat machine is ancient technology now, only a step above someone with a grinding rock and hand tools. The shop is taking care of it and using it properly so the work is good but could be better with some minor changes. That machine will only be as good as the care put into set-up for the cut.
I would have liked to see the machinist show the process for checking taper and wear in the valve guides prior to setting the head up for making cuts as these are used guides and will have wear inside. There should be a selection of sizes to choose from for the pilot rod so you can find the tightest fit while the pilot still remains free moving in the guide. Pilot rods can be sized by the 1/10 of a thousandth when ordered. The closer that rod fits the better the end result. I only saw one rod chosen and it was forced down into the seat for the guide leveling process, something that should be avoided as you can force the guide to wedge at an angle when inserted into a less than ideal guide bore when the shoulder on the pilot meets the possible tapper at the end of the guide. This can cause the seat to be tilted in relation to the guide and that tilt will transfer to all later cuts.
You should always chuck NEW or used valves into a face cutter to check for bent or out of round valves even if you do not plan on actually facing them.
I can see a rounded leading edge on his seat cutter in the video, a touch-up with a green wheel would bring his cutter to life again and result in a better seat. If you notice in the video the pilot wobbles in the hole as he makes the cut to the seat because the cutter is dull and he's rubbing the profile into the seat more than he is cutting the seat. That will have a pretty finish but the job could be much better done with a correctly sharpened seat cutter. The idea here is to make the hole round and it could be much rounder if the cutter is sharp and not deflecting 1/16 an inch in every rotation of the spindle.
You notice he said he was planning to lap the seats. That's not a process you need when your machine is rigid and your cutter is sharp but it's a better process than running a dull cutter on a side-loaded wobbling pilot and calling it a done deal. Granted he only lapped one set of valves to verify his seat location.
Lapping valves is a step backwards towards the grinding rock as you are using grit to finish your seat which in poorly trained hands can embed the grit into the seat and valve faces and continually grind away at your seat work as the valve rotates in an operating motor. This problem can be seen on heads with lapped seats in motors that are run for a short time and are pulled apart at a later time. The seats will grind them selves wider and wider making the work put into having the sealing pressure being concentrated in as thin a seating surface as possible be a wasted effort after some running time. The embedded grit doesn't go away it gets pushed into the valve face deeper and deeper as the engine runs allowing it to continue a cutting action on the seat job. Slamming the valve into the seat while lapping will embed the grit of the compound into the valve face. I can hear and see this being done in the video, not an ideal way to do the work but in the long run it is not the end of the world.
An engine is an air pump. It will work when it is worn out or perfectly machined. Hard run race engines are put together with loose tolerances for reliability yet the same engine going into a passenger car for use in commutes is put together tightly for reliability. At the end of the day any reasonable amount of effort will give you a working product and I have respect for people who do the best they can with the tools they have.
i love all this ill OCD machining/engine build stuff, radial cut, dome geometry and volume balance, dynamic rotational mass crank balancing and so on, felt so good
Dude goes on vacation and comes back with a master plan. I'm super duper excited to see what the outcome of this build will be. Thanks Jafro.
That man has so much knowledge it really amazes me how much he knows!
if it's his job, i would not expect to be amazed that he knows what he is doing
Thank you for this video and thanks to the machinist who let you recon his process.
i need to find a machinist with this mutch passion into his work for my projects in my area. i would gladly pay the bull.
I work with block heads every day for a year and I rest watching videos about it at home. Lmao kkkk best work for someone who wants to start a career with engines or engineering, you can learn a lot from these workshops.
Yessir! I'm so grateful to Ballos Machine for letting me in here for this. I have a few career-oriented channels in my subscriptions as well. I laugh at myself for the same thing!
You took all your work going out the door so easily.
For the intended purposes of this video, it was very good. It was nice for that guy to walk the audience through. But for any one here that does performance cylinder heads or knows the process, probably will approach the valve job differently. Just a couple things I saw and disagree with was that he seemed to use too aggressive of lapping compound. I use nothing more than 400 grit and you should use dykem on the seat and valve to see if it cut concentric or not. As far as the cutter, there is nothing performance about a 30/45/60. That is a normal valve job you'll get from a rebuilder shop. Once again, not bashig by any means, just voicing my perspective on this. All in all, I think this is great you take your time to make videos for the public. Good on you for that.
+recordbreaker5 There are many aspects of performance, and many points I agree with you on… for instance, I hate radius cutters in general. That's not my preferred equipment for cutting valve seats on any performance job, but it costs $1700 less and isn't what's responsible for the biggest gains that I'll be able to feel or measure from the driver's seat. To me, that's money well saved. While a valve seat can be a limiting factor, it's not where the majority of "performance" gains come from. Keep in mind, when Mark says "performance cutter", all it denotes is that there are 2 kinds of cutters available for this particular machine. Variations in how wide the 30/45/60 angles are… are why it's referred to by Sunnen as a "performance cutter". The "performance cutter just has a longer 30 on it, and a shorter 45 and 60. It's intended to move the seat out closer to the margin of the valve which actually shortens the life of the valve job, but improves airflow over a standard cut. It's that simple. If anyone hears "performance cutter" and assumes that using that tool automatically means they're going to end up with the ultimate valve job in under 2 hours and for less than $300, then they're a victim of their own assumptions. It's just a seat that flows better than the standard cutter will cut. A seat that doesn't match the exact lengths of the recommended 30, 45 and 60 cuts. One that Sunnen claims will flow better. A standard seat has wider 45's and 60's so that the valve job lasts longer. It trades flow for a bit more durability, that's all.
The weakest link in 99.999997% of professionally-built "performance cars" is always the driver, not the valve seats. "Performance" is the most abused term in automotive engineering because what's the standard? Performance what? Whenever someone thinks they have a "high performance" machine, they get butt-hurt the moment they find out someone else is faster. Problem is… someone else is always faster. Unless their name is Kye Kelly of course. If the standard is "flows better than stock", then nearly any bolt-on upgrade from an air filter to an exhaust tip turns a street car into a performance car. That's awesome from a sales pitch perspective, but that won't change Kye Kelly's opinion of your car. That's why performance is a subjective term. It's splitting hairs. He-said-she-said. All "performance" denotes is it's intended use.
Putting a 9 angle valve job on a normally-aspirated economy car won't magically turn it into a "performance car", just like using a standard cutter on a GT-40's valve seats won't turn it into an economy car. You also mentioned the same thing I think about permatex lapping compound. I've actually mentioned that in this video, and a previous video where I covered the shade-tree approach to valve jobs. If someone wants to spend $2,000+ or 100 hours dressing stones and cutting seats for 3 extra CFM, then they know what their reasons are, but everyone else is going to end up with a valve job done on a radius cutter because the machinists doing the work would rather not spend their whole week on it, and because in nearly every practical case with every rebuild, $2,000 can make a much bigger difference somewhere else. I've got a set of GTP heads for reference. I know what actual "performance" heads look like. You're correct, perspective is everything in this discussion. I'm not arguing with you, I'm agreeing with you. The reason I made this video is because nobody who knows how to grind the highest performance seat has the camera, knowledge, ability, or drive to make free educational videos for the public on how to do it because it works against their livelihood. That, and they've spent their lifetime developing different talents. Of course, if I'm wrong about that, I'll be the first person to favorite, like, subscribe to and share their video with my audience because I love that kind of shit and so do the people who follow me. :)
excellent vidja, great to be able to peak over the shoulder of a pro at work, Mark the machinist would be a good teacher, explaining every step along the way, thanks.
That cylinder head is a work of art--absolutely beautiful. Jaguar? I worked with Chrysler with the original Hemi in the 1950's--what we wouldn't have given to be able then to advance to a 4-valve layout (but the accountants would have vetoed it, as they did with the original hemi in 1958). It's not well known why exhaust valves are usually of a smaller diameter than intake: the physical mass flowing through the exhaust valve is significantly less than the intake due to the extraction of energy from the gas/air mixture
, which departs through the crankshaft.
plus in a NA engine, the exhaust is under pressure too compared to intake charge, so larger valves arent needed compared to intake.
Great video and top notch workmanship-- many years ago I had a 74 Kawasaki Z-1 900 bored out to 1015 cc and I had Manley SS oversize valves that had 'reliefs' for better flow, also had the runners cleaned up and port matched, Megacycle 417 lift cams too
This video is ridiculously valuable. Thank you for making it and sharing it with us!
Absolutely brilliant. I loved the CV joint on top of the valve grinder to use the machine torque but not the head bearing. Using the seat itself as the rotory guide is standard I guess but I never knew.
That is one calm machinist
It's either daily blowies or Xanax..I can't figure it out
Hey there jafro, I've been subscribed to you just to watch and learn some Asian tech, I'm a GM master tech and grew up building big inch 1/4 engines. Great videos and very informative. Gotta remember to mention the engine is just a pump, all of your power is made from airflow I. E. heads and the right combo. If you already did I apologize. Sorry for rambling. Keep it up brother.
Made me understand the definition of multi angle valve job. Thanks.
Thanks for this quality video, learned a lot (and with your other cylinder head 101 series, too). Cheers!
This guy. The Bob Ross of cylinder heads... lol
***** That is hilarious! You're the second one to point that out. Who would you rather have working on your head? The Bob Ross, or the John McEenroe machinist? :P
***** definitely Bob Ross! lol I can only imagine what John McEnroe would do to a head!! lol
Let's tap a little happy valve
The Da vinci of cylinder heads maybe even. Makes me wish the technology from the movie "Brainstorm" was an actual thing. Just burn every iota of that expertise into my mind. This guy truly knows his beans.
Joseph Ross i was thinking the same thing “an over here we have a nice polished happy port...”
Not gonna lie, I was hoping I was going to see something here to encourage me that a home valve job is possible since I seem fascinated with precision machining. No joy. I also just priced that Sunnen machine. Ouch. Thanks for the video and to your machinist, his explanations are excellent.
check out newaymfg.com. There are affordable home cutter solutions. Amazon has many sets available that are about equal to what a machinist charges for cutting seats. Don't leave the guides out. I just did a great video about this inspecting my Galant VR-4 heads. Make sure the rest is up to snuff before buying that cutter.
@@Jafromobile I actually just watched a few videos on that because I saw it in the Goodson catalog. I wouldnt even mind the motorized tool and their valve grinder at some point...or at least buy the transmission shaft and use my variable speed drill motor. Do you know if they have a decent 75 degree cutter or whatever you would use to oversize the valve properly? Thanks for supporting your older videos!
I am in the industry (Regis shop supplies) and I love watching him. It really is like watching Bob Ross paint happy little trees! I've been in a few of those wrench throwing shops.....
This is great, I loved watching this. Big thumbs up. One thing: he said this method is better than grinding because the radius provides better flow. Another guy on her who uses stones says grinding is better. I'm beginning to think it doesn't really matter.
I went school for this. watching videos great refresher course for me. Especially this video man you reminded of my instructor from last MA class. You make a great teacher. :)
Clarence Vaughan Man, I didn't even do all the hard work. I hope you're talking about Mark. That's one even-keeled dude. I always have a great time working with him.
Jafro, your videos have been instrumental in me learning engine rebuild skills. Especially related to head work. Its saved me a lot of money on my bmw engines so far 😆
Used to use an old machine like this. Did a great job but tedious and time consuming lining everything up. Got onto a Serdi after that and man what a difference! Much better design!
watching that machine work is so satisfying
...chamber and sunken exhaust valve seats to reduce the amount of the intake air charge that flows through the exhaust valve during the overlap period. You can read more about it online on his website. The case study he used was of a heavily turboed (38lb boost) Mitsubishi 2L motor putting out approximately 700hp, after installing the POLYquad head he saw gains of ~90hp at 5lbs less boost pressure. Pretty cool stuff that might be worth checking out!
That was some incredible head. This guy has a future in movies.😄😄😄
Hey Jafro, you should look into building a POLYquad cylinder head, This dude David Vizard "invented" it. Basically 4 valve heads generally have poor low end torque because they don't have a lot of swirl at low RPM that promotes good fuel atomization and a more complete combustion. 4 valve heads are also prone to shoot fuel out the exhaust valve during valve over lap. The POLYquad head solves these problems by using different sized valves with a flow bias to promote swirl in the combustion...
now thats a mechanic that knows how to take pride in his work
good job, DSM FTW!!
Your Mitsushitty might be the first one that actually runs real good after all this work you've done and had done. Like you said they cast these heads like total garbage. You need to put the care into it to make it run right. Doing great! Got a vid of it all done? Love to see it...
This is the build that's taken 7 years to start. I've been quietly stockpiling more parts and more tools for it while accidentally building one of the world's fastest Elantras. That was a stupid achievement that could be easily shattered with enough welding wire and lack of concern for safety, but you're not late to the party, and this head is about to get put to use. What you saw wrong with this head is nothing like that Elantra's cylinder head's problems were like. The head here was from an early production (October 1994) second generation Eclipse GSX. The earliest of the 2g's before they sold out of their entire inventory which made Mitsubishi turn the production lines up to 11 and rushing everything else. This casting is the best they ever did for a USDM 4g63. But it's their post-casting handling and cleanup that has always sucked no matter what country it was cast in or when. The casting on this head is amazing compared to the one on the Hyundai. They both had the same post-casting cleanup issues with the flash obstructing the oil return, both had rough, sharp protruding casting lines, but the GSX head didn't have mis-aligned ports or Swiss cheese holes in any of the casting. It didn't have large protruding casting flash inside the runners. She's straight as a tick. This is the good one. This is the engine you will finally see getting built right now. There's a lot of great technical videos that came from that Hyundai along the way, though. It was an all stock parts build, already auto-to-manual swapped when I got it. I blew both it and my GSX up at the same time leaving me with 3/4 of my fleet broken and un-driveable. I put my GSX's cams, valve springs and turbo in the Elantra as hand-me-downs to get it going. I bought performance parts for the Colt that actually came off of this car. I threw in a spare crankshaft I had sitting around and re-machined everything else back into shape, re-used everything else in the same rotating assembly that blew up before, I didn't even hone it, and it's about to be one of 3 total Elantras on the planet that have ever run a 12 second 1/4 mile pass. There's only 2 right now in the databases. It's inevitable that I will be the third. It's just my spare used parts from engines that my friends and I have blown up thrown in a junkyard chassis. This just doesn't make that much sense to me that the bar is set this low. But anyway, I want to welcome you aboard with these cliff notes so you can see what happened here, why there was a GSX build underway that suddenly turned into technical videos about an Elantra. The Elantra is NOT my first love. The GSX is what I've been working on lately, it's the one I won car shows with, and it's coming back better than ever before.
The Galant in my driveway is a car that I bracket raced through the quarter-finals in 10 years before I bought it. On our first rounds racing, my Galant's owner's opponent red-lighted, and I out-ran my dial-in time, breaking out, and ended my night early. He threw me the keys and I completed 5 more rounds of eliminations in his car. I was having such a good time I didn't realize I went out in the quarterfinal race. This was back when it was his daily driver. The track ended up mailing him a check for his winnings. This channel originally was originally supposed to be about a Dodge Colt, because everything else used to run. So, welcome aboard!
@@Jafromobile I had a 74 colt i used to jump road humps with. was a fun little car. Wish i could find one again.....
Dear doc Jafro im a fan... you are the best. BR und salutee' from Flensburg SH in Dax Raich ... !!! Keep rollin ... u my man.
Sir,,it's the,best way to,work on,all Cylinder, all heads taking special care, n precision, increased horsepower, help to cut n reduce pollution, n,helped ,to save fuel,,,(is not the, engines, is the problem,,,is we,) thanks u,sir,,
Great video, had a bunch of engine work done in my younger years with some explanation but this is exactly what I like.
very nice vid! these mods will improve the cilinder filling a lot , most gains will be at low valve lift, both on opening and closing of the valves. The engine should gain torque over the entire rev range. And maybe also start spooling up the turbo at a lower rpm.
the operator needs to check the bubble on the head of VGS machine first,then adjust cylinder head to vgs head for north and south adjustment. then set bubble for left and right tilt on cylinder head then adjust vgs head to cylinder head.
Awesome video. That machine is incredible. So precise (granted you set, check and recheck). I like the level transfer. That is a real true. Gravity doesn't lie.
I used to cut seats manually for 3yrs..I love my old job
Thats a good head job, time and patience brings good results, along with the extra relief angles.
Thats a good looking valvejob, i like how the transitions are so smooth.. Thumbs up for your videos, I enjoy them, keep the camera rollin' bro.
He did a great job with the old sunnen machine. I actually prefer that machine over the fancy part cnc sunnen with the touch screen. For how expensive that machine is you would think the touch screen would be better.. but one big thing here is that the whole port is based around your valve size. To get the most out of your heads you are going to want to do a bowl cut and blend your valve job again with your bigger valves. Dont forget you need to resize your venturi! Extremely important!
I love these to keep comments and respectful for these videos
The southern accent is so relaxed and calm..
ok I've watched a load of your videos Jafro and I've come to the decision.....This job as a auto fitter is boring, I really enjoy the machining of engine components and therefore must find a machine shop to work in. lol Cheers for the very interesting and informational vids and keep um coming!
Great Video! I have to admit tho..., I feel like I might be a bit of a freak watching a video of this detail and LOVING it! Thanks again.
Same here!
+Victor Bangle Your replies are disabled. It's not the head that was moving. The table this is on weights over 800lbs. Actions were taken to compensate for this in this very video. There's always a couple thousandths of an inch of deflection in the guide because if there wasn't, it would get stuck inside the valve guide. The reason you cut, inspect, lap, cut again, lap again and inspect is to ensure you're setting your stops correctly. If it chatters, that's bad... but the process accounts for the smaller guide variable.
***** that's cylinder head,work was professional real nice thank's for this technical video
+Jafromobile Hey boss a friend of mine has one of those 4G63 and I was just curious as to how those inconel valves treated you?
OK HEY I NEED EVERYONE TO HELP ME I need new valves and seats for my Honda trx450r. If I buy a new cylinder head and valves that are the same dimensions will it be ok and work. Oem cylinder head, oem shape valves or something like that you get what I mean but will it take any work or valve cutting after that
Thanks for showing the cuts on the valves, lots of great info 💪👍💯
I Love this level of DETAIL! Truly Educational! Thanks again for these type videos!
salute to the great machinist
FELICITACIONES ERES TODO UN MAESTRO EXPERTO EN EL ARTE DEL MECANIZADO CUANDO NO DARIA POR APRENDER DE TU SABIDURIA SALUDOS DESDE COLOMBIA
Damn! I never knew how much work they put into this, thought it was a simple as 1, 2, 3, Good work machine shop and good job filming and the effort to help us all :D.
Awesome video! Big props to your machinist for letting you film all this and talk you through everything. Looks like you have a good relationship built there. In watching this I have one question. Why machine these flat, angled surfaces in to our valves for improved air flow when(by my reasoning) flow could be even better with a radiused(rounded) surface into and out of the combustion chamber apart from the flat valve-valve seat surface???
You could do voice stand ins for Matthew McConaughey, I walked in my bedroom and this vid was playing but I was busy doing something, but I wondered what movie was on, I recognized none of the lines.
Great video man. Many gear heads will find this very interesting.
Great Job. We need a mechanics like that. All the best mate
2:00 a 6 or 7 inch pair of needle nose vise grips works almost as near as fast as that tool does. Well, maybe its 2 times slower but it still gets the job done well and somewhat quick.
Very informative. Helps me a ton because I'm about to start a job doing exactly this. Thanks a lot.
Wow.. thank you for this video.. extremely well done! Mark explained it well. This is the correct way to do it. Now I know what went wrong with my valve job I had done a while back... I can confirm it was a HACK crap job! I know what to look for now.. Thanks again.. Kudo's!
Great video. Learned a lot.
One note..... was it me or was Matthew McConaughey narrating this video? Super cool🤙
Kept thinking "where's this 30 degree cut?" until 27:27, bingo! I see it! all makes sense!
Dude has a drill bit as a pointer for the setup jig lol. Hey if it works. Do it. Love it.
If that was a microscope you keep cutting till you have micro smooth finish.Very informative like going to school.